.users {
    float: left;
    text-align: left;
    width: 340px;
}

.tab-button {
    padding: 6px 10px;
    border-top-left-radius: 3px;
    border-top-right-radius: 14px;
    border: 1px solid #42b983;
    cursor: pointer;
    background: #f0f0f0;
    margin-bottom: -1px;
    margin-right: -1px;
}

.tab-button:hover {
    background: #e0e0e0;
}

.tab-button.active {
    background: #e0e0e0;
}

.tab {
    border: 1px solid #42b983;
    padding: 10px;
}

.main {
    float: left;
    width: 700px;
}